P6 Troubleshooting
Digital display output
Description
▪ 1P6 indicates compressor A inverter module protection.
▪ 2P6 indicates compressor B inverter module protection.
▪ When a P6 error occurs, a manual system restart is required before the system can resume operation. The cause of a
P6 error should be addressed promptly in order to avoid system damage.
▪ All units stop running.
▪ Error code is displayed on the main PCB and user interface.
Possible causes
▪ Inverter module protection.
▪ DC bus low or high voltage protection.
▪ MCE error.
▪ Zero speed protection.
▪ Phase sequence error.
▪ Excessive compressor frequency variation.
▪ Actual compressor frequency differs from target frequency.
Specific error codes for xH4 inverter module protection
If a P6 error code is displayed, press button SW3 (to No.36 item) until one of the following specific error codes is displayed
on the digital display: xL0, xL1, xL2, xL4, xL5, xL7, xL8, xL9. Refer to Figure 5-4.3 and Table 5-4.1.
Figure 4-4.1: Button SW3 on main PCB
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